a person who travels at high speed.

1915–20; speed + -ster

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World English Dictionary
speedster (ˈspiːdstə)
a fast car, esp a sports model

Collins English Dictionary - Complete & Unabridged 10th Edition
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Example sentences
The speedster is still a high school prospect but can clearly skate with the best of them.
As a vehicle, the rototiller plus cart was hardly a speedster.
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